Skip to content
Define AviationCFI lesson plans to teach aviation lessons

ASOS

Weather Services

All definitions
« Back to Glossary Index

Automated Surface Observing System

The primary automated surface observing system for the United States, jointly operated by the NWS, FAA and DoD. It produces the METAR reports pilots read.

Source FAA Aeronautical Information Manual · checked 2026-08-25

« Back to Glossary Index

More in Weather Services

Enjoying Define Aviation ad-free?

Chip in and ads disappear right away in this browser — cancel anytime, no account needed.

Secure checkout via Stripe — Apple Pay, Google Pay, and cards.